25c gp4000s. Some of the chipseal is quite rough around the back and there's a rumble strip for much of the way up the lake. Lower pressures are good. Whatever you go for make sure they are reasonably new and you can get them on and off easily.

I ran these very tyres last year. All good! I'm a bit lighter, but still enjoy the comfort of the 25mm. Run 85psi fr/90rr in the wet at 80kg. You'd want to add another 5 or 10psi, but I suggest you experiment yourself.

Price seems good. Also, there is no real diff between the original gp4000s and the v2 that I can find. In fact, my v2's have worse cuts in them, but YMMV.

I got 5000k out of a set of 23mm. I'd put a couple hundred k on a new set before the ride, but that is me.